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Method for casting aluminium alloy

An aluminum alloy and alloy technology, applied in the field of aluminum alloy casting, can solve problems such as cracks in ingots

Active Publication Date: 2005-11-09
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a casting method of aluminum alloy, thereby solving the defect that cracks are easily produced in the ingot after casting high copper aluminum alloy 2Al4g

Method used

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Examples

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specific Embodiment approach 1

[0004] Specific Embodiment 1: This embodiment is realized through the following steps: 1. Complete the batching work of 2Al4g and make the weight percentage of Si in the alloy composition be controlled at 1.0~1.05%, and the weight percentage of Mn be controlled at 0.85~0.90%; 2. The alloy is smelted under the condition of heating to 720-770°C, argon or chlorine gas is injected into the bottom of the alloy melt for 15-20 minutes, and then left to stand for 27-32 minutes; 3. Pour the alloy melt into the cavity, and the pouring is completed Stop for 3 to 5 seconds at half time, then continue pouring, and keep the alloy temperature at 740-750°C during the pouring process. This embodiment also includes step 4, adding molten aluminum to the cavity at any time until the alloy in the cavity is solidified. The purpose of adding this step is to add molten aluminum during the cooling and contraction of the alloy to reduce the shrinkage stress of the alloy ingot. At the same time, the add...

specific Embodiment approach 2

[0005] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 2, the alloy is smelted under the condition that the alloy is heated to 730° C., and chlorine gas is passed into the bottom of the alloy melt for 20 minutes. Other steps are the same as the first embodiment.

specific Embodiment approach 3

[0006] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 2, the alloy is smelted under the condition that the alloy is heated to 760° C., and the bottom of the alloy melt is injected with argon gas for 15 minutes. Other steps are the same as the first embodiment.

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Abstract

A casting method for Al-alloy includes such steps as proportionally mixing raw materials, heating to 720-770 deg.C, smelting while introducing argon gas or chlorine gas from its bottom, laying aside for 27-32 min, pouring half of the molten alloy, and pouring rest of molten alloy. Its advantage is high quality.

Description

Technical field: [0001] The invention relates to a casting method of aluminum alloy with high strength and good heat resistance. Background technique: [0002] Adding copper to the existing aluminum alloy can form a high-copper aluminum alloy 2Al4g. The composition of 2Al4g is (Si; 0.80-1.05%, Mg: 0.45-0.75%, Cu: 4.10-4.70%, Ti: 0.02-0.10%, Mn: 0.85-0.90%, single impurity ≤ 0.05%, total impurity ≤ 0.10 %, the rest is Al.), this alloy has higher strength and hardness, and its heat resistance and corrosion resistance are also improved. However, due to the increase in the weight of copper, although the strength and hardness have increased, the difficulty of casting has greatly increased. During the finishing and soaking process of casting, when the flow is stopped, the normal casting is destroyed, the liquid cavity gradually disappears, and the metal at the head of the ingot is hindered by the surrounding and lower metal, so that it forms a large gap along the width direction...

Claims

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Application Information

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IPC IPC(8): B22D21/04
Inventor 王德满单长智吴欣凤王贵福郝志刚李海仙李春生
Owner NORTHEAST LIGHT ALLOY CO LTD
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